Every feature of the Whisperﾃつｮ EX has been designed with simplicity and convenience in mind. This is truly the intuitive filtration system.;Simple Set Up - Ready to go right out of the box. No priming required.;Scientifically Engineered Water Flow -- Continuous flushing action prevents debris buildup.;Outflow maximizes water agitation and oxygenation. Whisperﾃつｮ EX Filtration Systems use Tetra EX Carbon Filters.